linux-kernel - Tool for sampling /proc/net/softnet

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Message-ID: <20160307163607.1da5f17e@redhat.com>
Date:	Mon, 7 Mar 2016 16:36:07 +0100
From:	Jesper Dangaard Brouer <jbrouer@...hat.com>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:	Tom Herbert <tom@...bertland.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Tool for sampling /proc/net/softnet_stat statistics

Hi Google,

While playing with RPS, I needed to read stats from 
/proc/net/softnet_stat and the tools I could find [1] and [2] was not
very good.

I lack of better, I coded up my own tool softnet_stat.pl here:
 https://github.com/netoptimizer/network-testing/blob/master/bin/softnet_stat.pl

The output format/columns in /proc/net/softnet_stat is undocumented,
plus values are printed in hex.  E.g. to decode the columns you need to
read kernel function kernel softnet_seq_show() in
kernel/net/core/net-procfs.c.

To make things easier I wrote this small perl script for get
so human readable statistics from /proc/net/softnet_stat.

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  Author of http://www.iptv-analyzer.org
  LinkedIn: http://www.linkedin.com/in/brouer

[1] https://www.redhat.com/archives/rhl-list/2007-September/msg03735.html

[2] https://gist.github.com/SaveTheRbtz/172b2e2eb3cbd96b598d